Crustose is similar to other lichens because they share a similar internal morphology.

Based on similar morphologies, these species have been placed in seven species groups:

Tesch (1908) was the first to group together the species of Atlanta sharing similar morphologies.

The two currently described species of Microcambeva have similar general morphology.

Many of these have been grouped by a similar morphology.

Most share a very similar morphology, but many of these groups contain taxa which are more aberrant.

The name reflects the difficulty in distinguishing this species from P. praeputialis because of their very similar morphology.

The investigations also kept awake that the own Nature was in charge to forge a similar morphology to which existed before 2003.

The genus includes a discrete group of plants with similar morphologies.

Both flowers have a similar morphology and pollen differentiation between the two species is very difficult.